gcc/gcc/varray.c

/* Virtual array support.
   Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003
   Free Software Foundation, Inc.
   Contributed by Cygnus Solutions.

   This file is part of GCC.

   GCC is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   GCC is distributed in the hope that it will be useful, but WITHOUT
   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
   License for more details.

   You should have received a copy of the GNU General Public License
   along with GCC; see the file COPYING.  If not, write to the Free
   the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
   MA 02111-1307, USA.  */

#include "config.h"
#include "errors.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "varray.h"
#include "ggc.h"

#define VARRAY_HDR_SIZE (sizeof (struct varray_head_tag) - sizeof (varray_data))

/* Do not add any more non-GC items here.  Please either remove or GC those items that
   are not GCed.  */

static const struct {
  unsigned char size;
  bool uses_ggc;
} element[NUM_VARRAY_DATA] = {
  { sizeof (char), 1 },
  { sizeof (unsigned char), 1 },
  { sizeof (short), 1 },
  { sizeof (unsigned short), 1 },
  { sizeof (int), 1 },
  { sizeof (unsigned int), 1 },
  { sizeof (long), 1 },
  { sizeof (unsigned long), 1 },
  { sizeof (HOST_WIDE_INT), 1 },
  { sizeof (unsigned HOST_WIDE_INT), 1 },
  { sizeof (void *), 1 },
  { sizeof (char *), 1 },
  { sizeof (struct rtx_def *), 1 },
  { sizeof (struct rtvec_def *), 1 },
  { sizeof (union tree_node *), 1 },
  { sizeof (struct bitmap_head_def *), 1 },
  { sizeof (struct reg_info_def *), 0 },
  { sizeof (struct const_equiv_data), 0 },
  { sizeof (struct basic_block_def *), 0 },
  { sizeof (struct elt_list *), 1 },
};

/* Allocate a virtual array with NUM_ELEMENT elements, each of which is
   ELEMENT_SIZE bytes long, named NAME.  Array elements are zeroed.  */
varray_type
varray_init (size_t num_elements, enum varray_data_enum element_kind,
	     const char *name)
{
  size_t data_size = num_elements * element[element_kind].size;
  varray_type ptr;
  if (element[element_kind].uses_ggc)
    ptr = ggc_alloc_cleared (VARRAY_HDR_SIZE + data_size);
  else
    ptr = xcalloc (VARRAY_HDR_SIZE + data_size, 1);

  ptr->num_elements = num_elements;
  ptr->elements_used = 0;
  ptr->type = element_kind;
  ptr->name = name;
  return ptr;
}

/* Grow/shrink the virtual array VA to N elements.  Zero any new elements
   allocated.  */
varray_type
varray_grow (varray_type va, size_t n)
{
  size_t old_elements = va->num_elements;

  if (n != old_elements)
    {
      size_t elem_size = element[va->type].size;
      size_t old_data_size = old_elements * elem_size;
      size_t data_size = n * elem_size;

      if (element[va->type].uses_ggc)
	va = ggc_realloc (va, VARRAY_HDR_SIZE + data_size);
      else
	va = xrealloc (va, VARRAY_HDR_SIZE + data_size);
      va->num_elements = n;
      if (n > old_elements)
	memset (&va->data.c[old_data_size], 0, data_size - old_data_size);
    }

  return va;
}

/* Reset a varray to its original state.  */
void
varray_clear (varray_type va)
{
  size_t data_size = element[va->type].size * va->num_elements;

  memset (va->data.c, 0, data_size);
  va->elements_used = 0;
}

/* Check the bounds of a varray access.  */

#if defined ENABLE_CHECKING && (GCC_VERSION >= 2007)

extern void error (const char *, ...)	ATTRIBUTE_PRINTF_1;

void
varray_check_failed (varray_type va, size_t n, const char *file, int line,
		     const char *function)
{
  internal_error ("virtual array %s[%lu]: element %lu out of bounds in %s, at %s:%d",
		  va->name, (unsigned long) va->num_elements, (unsigned long) n,
		  function, trim_filename (file), line);
}

#endif